Remote Key Programming?
 

I bought a 2002 BMW 530i with only one remote key. I didn't want to spend the $160+ at the dealership so I bought a key from Ebay and had it cut and it does open the doors but can't start the engine.

Is there a way to program that key so the transponder in the car will accept this new key? Also does anyone know how to program the remote control on that key so it will operate on my car? Thanks.